Article
Nanoscience & Nanotechnology
Haiyang Fan, Chengcheng Wang, Yujia Tian, Kun Zhou, Shoufeng Yang
Summary: This study investigated the feasibility of using L-PBF to fabricate two Ti-6Al-4V-based bimetals, Ti-6Al-4V/γ-TiAl and Ti-6Al-4V/Ti-6242, which may have great potential for the future manufacturing of aerospace components. The bimetal Ti-6Al-4V/γ-TiAl was unsuccessfully built due to the intrinsic cold cracking of γ-TiAl processed by L-PBF. In comparison, the bimetal Ti-6Al-4V/Ti-6242 was successfully manufactured by L-PBF with a solid and defect-free interface.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Manufacturing
Liesbet Deconinck, Maria T. Villa Vidaller, Elena Bernardo Quejido, Eric A. Jaegle, Tom Depover, Kim Verbeken
Summary: This study investigates the hydrogen embrittlement of Ti-6Al-4V titanium alloy processed by different manufacturing methods. The susceptibility to hydrogen embrittlement is determined by the microstructure. In-situ electrochemical hydrogen charging tests and various analytical techniques are used to examine the mechanical characteristics and microstructural interactions with hydrogen. The presence of the beta phase increases the hydrogen uptake capacity and enhances the susceptibility to hydrogen embrittlement.
ADDITIVE MANUFACTURING
(2023)
Article
Chemistry, Physical
K. Yang, X. Yang, Z. L. Zhang, T. T. Zhu, J. Li, X. S. Xiao, Y. X. Liang, B. Jian, C. Li, S. N. Luo
Summary: The spall damage of Ti-6Al-4V alloy fabricated via laser powder bed fusion (LPBF) was investigated through plate impact in the build direction (BD) and the transverse direction (TD), focusing on its mechanisms and microstructure effects. Comparative analysis was performed on conventionally hot-rolled Ti-6Al-4V alloys processed with annealing and quenching. Results showed that the spall strength and Hugoniot elastic limit (HEL) of LPBF-fabricated samples were higher in the TD loading than in the BD loading. The LPBF-fabricated alloy exhibited a lower HEL but similar spall strength compared to conventionally fabricated alloys. The anisotropy in mechanical properties and damage was attributed to columnar prior beta grains, morphological, and crystallographic texture of martensite laths.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Manufacturing
Eskandar Fereiduni, Ali Ghasemi, Mohamed Elbestawi
Summary: This study compared the short-term creep performance of Ti64 and TiB-reinforced Ti64 matrix composite (TMC) parts, revealing that TMC exhibited a higher frequency of small voids in the as-built state and improved creep performance after heat treatment. The results demonstrated that TMC had a higher rupture time and enhanced creep characteristics.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Engineering, Manufacturing
Zhuoer Chen, Xinhua Wu, Chris H. J. Davies
Summary: This study demonstrates the use of surface roughness data as an evaluation tool for process variation in a commercial L-PBF machine, with factors like powder recoating, spatter generation, gas flow and heat transfer being identified as key contributors to intra-build quality inconsistency. Surface roughness was found to vary across build volume and progression, with strong impact from the orientation of inclined surfaces to the laser origin.
ADDITIVE MANUFACTURING
(2021)
Article
Engineering, Manufacturing
Shmuel Hayun, Einat Strumza, Peri Landau, Giora Kimmel, Yaron Ganor, Ori Yeheskel
Summary: Three types of Ti-6Al-4V alloys were prepared using different powder bed fusion methods. The thermal properties of the alloys were measured, and the effects of measurement direction and processing conditions were analyzed. The results showed that the thermal expansion and thermal diffusivity were influenced by the measurement direction and the porosity of the samples. However, after correcting for porosity, the thermal properties of the alloys were similar regardless of the production method. The study also discussed the relationship between the subtle differences in the samples and the oxygen content, microstructure processing route, and preferred orientation.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
M. Jia, Y. Alshammari, F. Yang, L. Bolzoni
Summary: TiB-reinforced Ti???6Al???4V composites with different B content were manufactured via flashless hot forging and the effects of solution plus aging heat treatments were studied. It was found that flashless hot forging can achieve fully dense materials, and the addition of B can significantly enhance the strengthening effect. The subsequent solution plus aging heat treatments can improve the mechanical properties and microstructure of the materials.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Engineering, Manufacturing
J. Chen, D. Fabijanic, T. Zhang, E. W. Lui, M. Brandt, W. Xu
Summary: It has been discovered that slow cooling from the beta phase field, at significantly reduced cooling rates (below 5 degrees Celsius per second), can result in the observed lamellar alpha + beta microstructure.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Yu-Wei Cui, Liang-Yu Chen, Peng Qin, Ruifeng Li, Qianhao Zang, Jinhua Peng, Lina Zhang, Sheng Lu, Liqiang Wang, Lai-Chang Zhang
Summary: This study investigated the metastable pitting corrosion behavior of LPBF-produced Ti-6Al-4V in Hank's solution using electrochemical methods. The LPBF-produced sample showed a higher frequency of pit nucleation compared to the annealed counterpart, mainly due to the passive films formed on the LPBF-produced sample having a higher flux of oxygen vacancies, absorbing more aggressive ions and producing more cation vacancies.
Article
Chemistry, Physical
Yuhui Tu, Sean B. Leen, Noel M. Harrison
Summary: This study investigates the effects of microstructure heterogeneity on the tensile behavior of Ti-6Al-4V alloy in the metal electron beam powder bed fusion (PBF-EB) processes and how it evolves following heat treatment. The results show that the microstructural gradient has an impact on the yield stress and initial hardening rate, and heat treatment can homogenize the microstructure.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Matthew K. Dunstan, Matthew O. Vaughn, James D. Paramore, Brady G. Butler, Andelle D. Kudzal, Kevin J. Hemker
Summary: In laser powder bed fusion additive manufacturing of Ti-6Al-4V, the rapid cooling rates and thermal cycling result in a martensitic microstructure, which leads to high strength but low ductility. Post-processing heat treatments, such as the thermo hydrogen refinement of microstructure (THRM), can be used to decompose the martensitic microstructures and improve ductility by inducing grain refinement. This study explores the use of THRM with a hydrogen atmosphere to manipulate microstructure and enhance tensile ductility in Ti-6Al-4V produced by laser powder bed fusion. Low maximum temperatures combined with an inert globularization heat treatment can achieve tensile properties comparable to hot isostatic pressing.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Lei Meng, Jingbo Gao, Jiaqi Hu, Yuzhe Yang, Yuxiang Gao, Xiaoli Zhao, Deliang Zhang
Summary: A box-shaped Ti-6Al-4V alloy part was fabricated using LPBF with a gas-atomized powder and annealed. The part exhibited blowhole defects and a columnar macrostructure. The mechanical properties showed anisotropy due to the columnar macrostructure and the presence of a preferred orientation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Manufacturing
S. L. Lu, Z. J. Zhang, R. Liu, Z. Qu, S. J. Li, X. H. Zhou, Q. Q. Duan, B. N. Zhang, X. M. Zhao, W. Zhao, P. Ramasamy, J. Eckert, Z. F. Zhang
Summary: The relationship between microstructure and mechanical properties in laser powder bed fusion (L-PBF) additively manufactured (AM) Ti-6Al-4 V alloy is complicated by the coupling effect of hierarchical microstructural features. In this study, the contributions of specific microstructures to strength and plasticity are clarified by controlling hierarchical microstructures through two-stage heat treatments. It is found that tensile strength is determined by the content of fine alpha' martensites and lath thickness, while plasticity is influenced by prior beta grain size and lath length. The simultaneous improvement of strength and plasticity can be achieved by increasing the alpha' fraction and refining prior beta grains and alpha laths. These findings provide guidance for optimizing the overall mechanical properties of L-PBF AM fabricated titanium components.
ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Asif Mahmud, Thinh Huynh, Le Zhou, Holden Hyer, Abhishek Mehta, Daniel D. Imholte, Nicolas E. Woolstenhulme, Daniel M. Wachs, Yongho Sohn
Summary: The study examined the mechanical properties of Ti-6Al-4V ELI alloy after post-heat treatments, showing that the alloy exhibited improved uniformity and ductility after hot isostatic pressing.
Article
Engineering, Mechanical
Arun Prasanth Nagalingam, Sharan Kumar Gopasetty, Jingjing Wang, Hemanth Kumar Yuvaraj, Abhay Gopinath, S. H. Yeo
Summary: Comparing the performance of L-PBF and wrought Ti-6Al-4V coupons, this research finds that aerospace MoM-treated L-PBF Ti-6Al-4V coupons have superior fatigue life and that the vibratory polishing process enhances both surface finish and fatigue life. Additionally, a life-cycle cost model assessment shows that L-PBF coupons are cost-effective for low-volume repairs, while the use of wrought material is economical for large-volume repair but may compromise fatigue life.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)